2016 CX-5 2.2L Diesel P2150 error

[HjaltiVignis]

Hello.

I am having trouble with my 2016 2.2L Diesel CX-5. I bought it at an auction recently and was told that someone put petrol instead of disel on it and after that these problem occured. (Even though I find it difficult to believe that.)

I get an error P2150 - Com2 ground short - Ground short upstream of cylinders no. 2, 3 injector circuit. Injectors 2 & 3 are not working and don´t get any signal from the PCM

We´ve spent over 20hours checking all the electricity in the engine bay, everything seems good, I ´ve changed the PCM as well as the injectors but still the same. Only firing up on cyl 1 & 4. Compression in the engine is good and all fuses are good.

So far nothing seems to be wrong even though something is clearly wrong.

Is anybody out there that might have the slightest clue about what could be wrong.

 

[Jonno21]

Misfuelling does happen unfortunately. It depends if the car was run with the petrol in it or not. If the fuel tank had been drained immediately after the incident then any damage would be minimal. Diesel fuel acts as a lubricant for the close tolerance fuel injection system and other moving parts involving the fuel system whereas petrol would strip away the lubrication and in a worse case scenario cause a fire. I suspect the complete fuel system and injectors will have to be replaced. There may also be some valve and head damage as the petrol may have caused detonation damage to the valves and cylinders. I'm sorry, but I'm surprised you bought a misfuelled car at an auction especially after having been told about it. I'm hoping you weren't told until after you bought it. It's a case of buyer beware unfortunately. I don't know anything about electrics so can't help.

 

[HjaltiVignis]

I knew about it. But the injectors, fuel pump, high pressure pump and the engine are good. It ran with petrol and was diagnosed with bad injectors. I changed the injectors but they were not the problem it seems.

 

[Jonno21]

I knew about it. But the injectors, fuel pump, high pressure pump and the engine are good. It ran with petrol and was diagnosed with bad injectors. I changed the injectors but they were not the problem it seems.

Ah. I see. I'm sorry I can't be of further help. I'm sure someone will be along soon.

 

[Chris_Top_Her]

You should try and find a copy of the workshop manual online.. it lists all DTC and their causes/troubleshooting. It's quite possible that is a straight wiring or module issue. I have the WS manual but mine does not cover diesel.

 

[HjaltiVignis]

You should try and find a copy of the workshop manual online.. it lists all DTC and their causes/troubleshooting. It's quite possible that is a straight wiring or module issue. I have the WS manual but mine does not cover diesel.

DTC in manual says injector 2 and 3 circuit input low. COM2 short to ground.

But we have neasured all wires according to the diagram we have of the car and they all checked out good. So there is something else causing the error.

 

[Kimhalv]

Hello. I have the same car, and same problem. What was the solution here?

 

[Gorrie]

Hello , did any one ever find the cause of this fault , have the same problem and done the same tests but cant find the fault

 

[yrwei52]

Hello , did any one ever find the cause of this fault , have the same problem and done the same tests but cant find the fault

Unfortunately the OP had never responded with his resolution. And the 2.2L diesel has never been available in the US other than the 2019 MY CX-5. Not many people are familiar with this problem related to the diesel. I guess a Mazda dealer in your area may be the last resort but that would be $$$$$.

 

[aj84]

Hello , did any one ever find the cause of this fault , have the same problem and done the same tests but cant find the fault

Did you find out, I've got the same problem.

 

[aj84]

Hello.

I am having trouble with my 2016 2.2L Diesel CX-5. I bought it at an auction recently and was told that someone put petrol instead of disel on it and after that these problem occured. (Even though I find it difficult to believe that.)

I get an error P2150 - Com2 ground short - Ground short upstream of cylinders no. 2, 3 injector circuit. Injectors 2 & 3 are not working and don´t get any signal from the PCM

We´ve spent over 20hours checking all the electricity in the engine bay, everything seems good, I ´ve changed the PCM as well as the injectors but still the same. Only firing up on cyl 1 & 4. Compression in the engine is good and all fuses are good.

So far nothing seems to be wrong even though something is clearly wrong.

Is anybody out there that might have the slightest clue about what could be wrong.

Did you find the problem mate?

 

[Gorrie]

Hi , had the same issues eventually put the car into a Mazda dealership, the problem was the injectors are high voltage (200v was what Mazda said) and when the injectors go faulty they put a spike back to the PCM and destroy it , Mazda had to replace the injectors and the PCM as independents can’t get access to PCM or ECU to try and repair them , the total cost of the repair was £3500 , car going a treat now

 

[aj84]

Wow so was the pcm damaged or injectors

 

[Gorrie]

Both had to be replaced unfortunately, injectors 2 & 3 were replaced,along with the PCM , I tried everything and a couple of garages and eventually it had to go to Mazda , if we had known at the time we would have put it to Mazda at the beginning and saved a lot of time

 

[aj84]

I know what you mean iv been of road for 2 months

 

[Gorrie]

We were the same, that’s why it went to the dealership , it was the only way to get it fixed , but car wasn’t worth anything the way it was , my understanding from the mechanic was this is an issue that they’ve come across before

 

[aj84]

It's a headache of a car

Do you think I should change ecu

DTC in manual says injector 2 and 3 circuit input low. COM2 short to ground.

But we have neasured all wires according to the diagram we have of the car and they all checked out good. So there is something else causing the error.

Did you find the problem

 

[yrwei52]

Do you think I should change ecu

It’s hard @Gorrie can answer your question as he isn’t a mechanism who has a chance to diagnose your problem which is complicated. But based on his posts:

Hi , had the same issues eventually put the car into a Mazda dealership, the problem was the injectors are high voltage (200v was what Mazda said) and when the injectors go faulty they put a spike back to the PCM and destroy it , Mazda had to replace the injectors and the PCM as independents can’t get access to PCM or ECU to try and repair them , the total cost of the repair was £3500 , car going a treat now

Both had to be replaced unfortunately, injectors 2 & 3 were replaced,along with the PCM , I tried everything and a couple of garages and eventually it had to go to Mazda , if we had known at the time we would have put it to Mazda at the beginning and saved a lot of time

Your PCM could be toasted too. You can replace the injectors and see if the DTC code is gone. Then plan to replace the PCM if needed.

 

[yrwei52]

We were the same, that’s why it went to the dealership , it was the only way to get it fixed , but car wasn’t worth anything the way it was , my understanding from the mechanic was this is an issue that they’ve come across before

Not trying to disappoint you, but for those who has a Mazda CX-5 with 2.2D diesel should seriously consider to get rid of the car while you still can. The infamous sudden overheating without any warnings, and sudden broken oil pump chain, can happen at any time. Once either one of them happens, it would cost you an arm and a leg to fix it.

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